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-- Copyright 2006-2017 Mitchell mitchell.att.foicica.com. See LICENSE.
-- Java LPeg lexer.
-- Modified by Brian Schott.
local l = require('lexer')
local token, word_match = l.token, l.word_match
local P, R, S = lpeg.P, lpeg.R, lpeg.S
local M = {_NAME = 'java'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
-- Comments.
local line_comment = '//' * l.nonnewline_esc^0
local block_comment = '/*' * (l.any - '*/')^0 * P('*/')^-1
local comment = token(l.COMMENT, line_comment + block_comment)
-- Strings.
local sq_str = l.delimited_range("'", true)
local dq_str = l.delimited_range('"', true)
local string = token(l.STRING, sq_str + dq_str)
-- Numbers.
local number = token(l.NUMBER, (l.float + l.integer) * S('LlFfDd')^-1)
-- Keywords.
local keyword = token(l.KEYWORD, word_match{
'abstract', 'assert', 'break', 'case', 'catch', 'class', 'const', 'continue',
'default', 'do', 'else', 'enum', 'extends', 'final', 'finally', 'for', 'goto',
'if', 'implements', 'import', 'instanceof', 'interface', 'native', 'new',
'package', 'private', 'protected', 'public', 'return', 'static', 'strictfp',
'super', 'switch', 'synchronized', 'this', 'throw', 'throws', 'transient',
'try', 'while', 'volatile',
-- Literals.
'true', 'false', 'null'
})
-- Types.
local type = token(l.TYPE, word_match{
'boolean', 'byte', 'char', 'double', 'float', 'int', 'long', 'short', 'void',
'Boolean', 'Byte', 'Character', 'Double', 'Float', 'Integer', 'Long', 'Short',
'String'
})
-- Identifiers.
local identifier = token(l.IDENTIFIER, l.word)
-- Operators.
local operator = token(l.OPERATOR, S('+-/*%<>!=^&|?~:;.()[]{}'))
-- Annotations.
local annotation = token('annotation', '@' * l.word)
-- Functions.
local func = token(l.FUNCTION, l.word) * #P('(')
-- Classes.
local class_sequence = token(l.KEYWORD, P('class')) * ws^1 *
token(l.CLASS, l.word)
M._rules = {
{'whitespace', ws},
{'class', class_sequence},
{'keyword', keyword},
{'type', type},
{'function', func},
{'identifier', identifier},
{'string', string},
{'comment', comment},
{'number', number},
{'annotation', annotation},
{'operator', operator},
}
M._tokenstyles = {
annotation = l.STYLE_PREPROCESSOR
}
M._foldsymbols = {
_patterns = {'[{}]', '/%*', '%*/', '//'},
[l.OPERATOR] = {['{'] = 1, ['}'] = -1},
[l.COMMENT] = {['/*'] = 1, ['*/'] = -1, ['//'] = l.fold_line_comments('//')}
}
return M
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